Accidental Cheater (oneshot ff)

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Introduction:
You;
Name : Y/n
Age : 21
Boyfriend : Jeon Jungkook
Location : Korea

*Alarm goes Off*
You lazily wake up in the morning.
"Ugh I don't wanna go to school" you complain
Eventually, you get up and start getting ready for school. You shower, brush your teeth, then hair, natural makeup, and choose your outfit.
You chose a simple skirt and t-shirt today.

*At School*
When you first get to school you're surprised to not see Jungkook waiting for you. Hmm
"Oh well" you sigh and start walking towards your class. In class you see that Jungkook has walked in with some girl. "Is that Yuna?" You think to yourself.
(Btw I'm not referring to any idol here because I don't like when people use my girl biases as a bad figure so I just randomly chose Yuna)
That's so odd... You and Yuna don't get along very well and Jungkook well knows that so he usually doesn't even go near her. You decide to just not think about it and continue your day. During class you see and hear them giggling together. Yeah you might be wondering where he was, Jungkook didn't sit next to you like he usually does. You find this whole situation shady but keep deciding to let it go.

*Few Days Later*
Recently you've been upset with Jungkook but hide your feelings from him, you hate starting fights. It's the weekend today so you thought to go visit Jungkook at his house and spend some time with him. You get ready, get in your car and drive there.

* 30 Minutes later, at Jungkooks house*
You knock on the door, but no answer. You see that the door is unlocked and as his girlfriend you have the right to go in, I mean he did give you a spare key , so what's the difference? I could've got in anyway.
"Jagi!? , It's me, Y/n ah" I yell
But still get no response. I walk up the stairs since he was nowhere to be seen downstairs and open his bedroom door. When I opened it.. tears immediately poured out of my eyes as I seen Jungkook and Yuna kissing. How could it be real ? I knew right then and there this sight would torcher me forever. I quickly slam the door back closed and run as fast as I could. I hear Jungkook yell
"Who's there!?"
Right when you get out from Jungkooks you get into your car as quick as possible. You quickly start the engine and drive away hoping you'll be safe on the road, eyes blurred from the constant pouring tears. You knew exactly what you were gonna do now.
When you get home you pack all your bags and start booking yourself a flight to America. Tears still flowing like a waterfall. You just felt so broke, you felt weak, and helpless. Were you just a toy? How could he treat you nothing when you gave 150% into your relationship all the time. He showed no effort. What a playboy. I feel betrayed. You booked your flight, finished packing your bags, and cried yourself to sleep. You didn't even care to eat .
*Next Morning*
You wake up extra early, text Jungkook to come over and start getting ready. By the time you're done Jungkook rings the doorbell. You tell him that you'll have to be taking a trip to a different country caused by your cousins passing.
"Aw no, I'll miss you baby" he says
Yuck, how fake, you thought to yourself.
"I'll miss you too" you pretend and flash a weak smile. Jungkook offered to drive you to the airport.
*Car*
The car ride was silent, you could barely handle looking at his now pathetic face.
*airport*
The whole time you were walking to your gate and checking in Jungkook kept hugging, holding your hands, and showing affection to you. You wish you could smile because of it, but you just couldn't, you knew you weren't the only one. So you would just lightly nudge him off.
"What are you doing? Let me hug you babe" he said slightly annoyed.
"Fine" you finally gave in,  you just let him love you, then again you were leaving today.
*Time Skip*
It was now time for you to leave...
You felt tears cascading from your eyes..
"Aww babe don't cry I'll miss you too" Jungkook said. You just nod in response. The saddest thing is that the real reason why you're crying is because he did you wrong.. he couldn't even stay loyal to you. By this point Jungkook was balling. You just couldn't stand seeing him cry, you wondered if he really cared. Or was he just excited for his new life with his other little side chick. They called your flight and now you REALLY had to leave him. He lifted you up and hugged you. But you had one last important thing to tell him.
"Babe, when you get home please go in our room and on our bed I left something I want you to see. Don't forget" I said
"Of course, anything for you, I love you" Jungkook replied. Lastly he kissed you passionately, and you walked away. Walking through the gates to your flight you just kept balling.
*Jungkook POV*
I got home, to mine and Y/ns house quickly and eagerly ran into our room. On the bed I saw a bag. I opened it. Inside the bag, I found a box? And a letter? I thought to myself that I'll read the letter first and then see what's in the box. ( btw you and Jungkook have your own houses but also own a house together)
The letter read:
Dear my love, Jeon Jungkook,
Jungkook we had a strong relationship, we really did. I gave you my heart and everything else.
Well I have something I want to tell you..
I saw you with Yuna, kissing. I felt my heart shatter into god knows how many pieces. I left. I didn't have courage to confront you. I didn't have the courage to walk in there and end our relationship. I get it.. I really do. I'm not good enough for a man like you am I? Should I even consider you a man? A good man wouldn't jeopardize his relationship with a woman who is actually committed to you. You just wasted so much of my life time on you. Do you think I'm easy? Am I just a joke to you? Because I thought you were my first and last love.. but I have to move on. And I'm never coming back. I lied. I couldn't say it to your face. Maybe sometime in the future I'll see you again but no time soon. Don't come for me, you won't find me. Don't wait for me, you'll never get me back. Don't contact me, you won't get an answer. Lastly, I'll always love you. How funny. You never even loved me. And even after you betray me, I still love you with my whole heart? That's sad. Goodbye Jungkook.
Sincerely, Choi Y/n
After I read that letter I just began to cry. I balled. I was screaming. I didn't care who heard.
"noooooo nooo how could this happen to me?"
No. I don't love Yuna. I never would do that to her. That night.. that night I didn't mean it. She must've put something in my drink. All I remember is Yuna showing up to my house uninvited.. and then... the door slamming.
No... no.. no I didn't do this. I didn't mean to. I drop the letter and cry my eyes out like there's no tomorrow. Then suddenly I get a phone call.
"Who'd be calling me now? It wouldn't be my love.. Y/n ah..." I thought to myself